// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2009 Hauke Heibel <hauke.heibel@googlemail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef EIGEN_STL_DETAILS_H
#define EIGEN_STL_DETAILS_H

#ifndef EIGEN_ALIGNED_ALLOCATOR
#define EIGEN_ALIGNED_ALLOCATOR Eigen::aligned_allocator
#endif

namespace Eigen {

// This one is needed to prevent reimplementing the whole std::vector.
template <class T> class aligned_allocator_indirection : public EIGEN_ALIGNED_ALLOCATOR<T>
{
public:
    typedef std::size_t size_type;
    typedef std::ptrdiff_t difference_type;
    typedef T* pointer;
    typedef const T* const_pointer;
    typedef T& reference;
    typedef const T& const_reference;
    typedef T value_type;

    template <class U> struct rebind
    {
        typedef aligned_allocator_indirection<U> other;
    };

    aligned_allocator_indirection() {}
    aligned_allocator_indirection(const aligned_allocator_indirection&) : EIGEN_ALIGNED_ALLOCATOR<T>() {}
    aligned_allocator_indirection(const EIGEN_ALIGNED_ALLOCATOR<T>&) {}
    template <class U> aligned_allocator_indirection(const aligned_allocator_indirection<U>&) {}
    template <class U> aligned_allocator_indirection(const EIGEN_ALIGNED_ALLOCATOR<U>&) {}
    ~aligned_allocator_indirection() {}
};

#if EIGEN_COMP_MSVC

// sometimes, MSVC detects, at compile time, that the argument x
// in std::vector::resize(size_t s,T x) won't be aligned and generate an error
// even if this function is never called. Whence this little wrapper.
#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T) \
    typename Eigen::internal::conditional<Eigen::internal::is_arithmetic<T>::value, T, Eigen::internal::workaround_msvc_stl_support<T>>::type

namespace internal {
    template <typename T> struct workaround_msvc_stl_support : public T
    {
        inline workaround_msvc_stl_support() : T() {}
        inline workaround_msvc_stl_support(const T& other) : T(other) {}
        inline operator T&() { return *static_cast<T*>(this); }
        inline operator const T&() const { return *static_cast<const T*>(this); }
        template <typename OtherT> inline T& operator=(const OtherT& other)
        {
            T::operator=(other);
            return *this;
        }
        inline workaround_msvc_stl_support& operator=(const workaround_msvc_stl_support& other)
        {
            T::operator=(other);
            return *this;
        }
    };
}  // namespace internal

#else

#define EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T) T

#endif

}  // namespace Eigen

#endif  // EIGEN_STL_DETAILS_H
